What does hyaluronic acid actually do in a cream like this, and how is it different from a serum?

Hyaluronic acid in this cream works primarily in the upper layers of the epidermis. A single molecule can hold many times its weight in water, so when applied topically it creates a thin hydrating film that helps the skin surface stay plump and elastic. This visually softens fine lines, smooths the complexion, and helps makeup sit more evenly. A hyaluronic acid serum typically uses lower molecular weights to penetrate deeper, but it still needs an occlusive or emollient layer — like this cream — to prevent that moisture from evaporating. Using both is complementary: serum first for deeper hydration, cream second to lock it in and protect the barrier. The cream alone still delivers meaningful surface hydration, which is often enough for early signs of ageing or seasonal tightness. Neither format replaces internal hydration or a balanced diet, and results are cosmetic — temporary improvement in look and feel, not structural change.